CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tongzhen Fan,Lichun Cheng,Changsheng Huang,Qingrong Yao,Wei Yuan,Zhao Lu,Qianxin Long,Huaiyin Zhou
LaNiO 3 is considered electromagnetic wave-absorbing material owing to its unique crystal structure and controllable dielectric constant. However, the effect of ion doping modification on microwave absorption performance remains to be thoroughly investigated. In this study, LaNi 1− x Ba x O 3 ( x = 0, 0.02, 0.04, 0.06) was prepared through sol-gel methods. The reflection loss (RL) of the sample in the 2−18 GHz band was calculated using transmission line theory . Specifically, LaNi 0.96 Ba 0.04 O 3 exhibited superior results, with an RL value of −34.54 dB at d = 3 mm and f = 6.80 GHz, indicating effective absorption within the C-band. These results suggest that adding an appropriate amount of Ba ions to the material can effectively regulate the electromagnetic parameters and optimize impedance matching . Introducing Ba ions into the crystal interior produces abundant defects, which provide active sites for multipolarization and ultimately improve the wave-absorbing properties of the material. In addition, radar cross section(RCS) simulations simulation after coating the samples on original ideal conductor (PEC) substrates provide support for potential practical applications of the material.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
Journal of Thermal Science
·
2023
·Vol. 32
·期 5
·1935-1944
·
IF 2.5
Cao Dingshan,Luo Cong,Cai Guoqiu,Luo Tong,Wu Fan,Li Xiaoshan,Zheng Ying,Zhang Liqi
Dry reforming of methane (DRM) process has attracted much attention in recent years for the direct conversion of CH 4 and CO 2 into high-value-added syngas. The key for DRM was to develop catalysts with high activity and stability. In this study, LaNiO 3 was prepared by the sol-gel, co-precipitation, and hydro-thermal methods to explore the influence of preparation methods on the catalyst structure and DRM reaction performance. The regeneration properties of the used LaNiO 3 catalysts were also investigated under steam, CO 2 , and air atmospheres, respectively. The results showed that LaNiO 3 prepared by sol-gel method showed the best DRM performance at 750°C. The DRM performance of the samples prepared by hydro-thermal method was inhibited at 750°C due to the residual of Na + ions during the preparation process. The regeneration tests showed that none of the three atmospheres could restore LaNiO 3 perovskite phase in the samples, but they could eliminate the carbon deposits in the samples during the DRM reaction, so the samples could maintain stable DRM performance at different cycling stages.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2015
·
IF 3.352
Xiao-Gang Zheng,Shi-Yu Tan,Li-Chun Dong,Shao-Bo Li,Hong-Mei Chen,Shun-An Wei
Plasma-assisted catalytic conversion of CH 4 and CO 2 into synthesis gas was performed in a dielectric barrier discharge reactor coupled with perovskite La–Ni nanoparticles (LaNiO 3 NPs). Compared to supported catalysts such as Ni/γ-Al 2 O 3 , La–Ni/γ-Al 2 O 3 and Ni/La 2 O 3 , LaNiO 3 NPs showed better catalytic performance. The results show that the low flow rate of feed gases and high input power were favorable for the conversions of CH 4 and CO 2 as well as the selectivities of desired products, but led to lower energy efficiency. A global kinetic model according to argon dilution in plasma-catalytic system was proposed and employed to foresee the CH 4 and CO 2 conversion assisted by plasma-catalysts hybrid effect. The kinetic model indicates that the reactant conversion rate was an exponential function of the discharge energy .
研究领域:
化学工程
·
材料科学
·
环境科学
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DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 133
·期 1
·209-227
·
IF 2.081
Ai Lin,Shi Yinteng,Han Yujun,Chen Jixiang
A series of Ni–La–O- T catalysts ( T- calcination temperature) were prepared via the sol–gel process followed by the calcination. They were tested for in situ aqueous phase hydrodeoxygenation (HDO) of methyl palmitate using methanol as hydrogen donor. In the calcined samples, NiO and La 2 O 2 (CO 3 ) formed in Ni–La–O- 550 and Ni–La–O- 650 . Apart from NiO and La 2 O 2 (CO 3 ), there was LaNiO 3 perovskite in Ni–La–O- 750 . Only LaNiO 3 perovskite existed in Ni–La–O- 800 . After the reduction at 650 °C, metallic Ni and La 2 O 3 appeared in all the catalysts. During in situ HDO, decarbonylation/decarboxylation was dominating, accompanying with the C–C bond hydrogenolysis and aqueous phase reforming of alkanes. H 2 was generated from not only the aqueous phase reforming of methanol but also that of alkanes. Liquid C 6 –C 16 alkanes were produced and C 15 alkane was main product. Among the catalysts, Ni–La–O- 750 afforded the highest activity for deoxygenation, C–C bond hydrogenolysis and aqueous phase reforming. The reaction temperature, reaction time, water and methanol loadings remarkably affected the products distribution. At a suitable condition, the yield of C 6 –C 16 alkanes reached 71.1% on Ni–La–O- 750 . Additionally, Ni–La–O- 750 was also very active for in situ HDO of methyl palmitate without methanol, however, the C–C bond hydrogenolysis was more serious.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
Theranostics
·
2017
·
IF 8.766
Xiaoyu Wang,Wen Cao,Li Qin,Tingsheng Lin,Wei Chen,Shichao Lin,Jia Yao,Xiaozhi Zhao,Min Zhou,Cheng Hang,Hui Wei
Catalytic nanomaterials with intrinsic enzyme-like activities, called nanozymes, have recently attracted significant research interest due to their unique advantages relative to natural enzymes and conventional artificial enzymes. Among the nanozymes developed, particular interests have been devoted to nanozymes with peroxidase mimicking activities because of their promising applications in biosensing, bioimaging, biomedicine, etc. Till now, lots of functional nanomaterials have been used to mimic peroxidase. However, few studies have focused on the Ni-based nanomaterials for peroxidase mimics. In this work, we obtained the porous LaNiO 3 nanocubes with high peroxidase-like activity by inducing its 3+ oxidation state in LaNiO 3 perovskite and optimizing the morphology of LaNiO 3 perovskite. The peroxidase mimicking activity of the porous LaNiO 3 nanocubes with Ni 3+ was about 58~fold and 22~fold higher than that of NiO with Ni 2+ and Ni nanoparticles with Ni 0 . More, the porous LaNiO 3 nanocubes exhibited about 2-fold higher activity when compared with LaNiO 3 nanoparticles. Based on the superior peroxidase-like activity of porous LaNiO 3 nanocubes, facile colorimetric assays for H 2 O 2 , glucose, and sarcosine detection were developed. Our present work not only demonstrates a useful strategy for modulating nanozymes' activities but also provides promising bioassays for clinical diagnostics.
研究领域:
生物传感
·
纳米医学
·
催化材料
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产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2020
·Vol. 26
·期 2
·142-147
·
IF 0
Zhang Chang,Wu Cong,Zhang Zhiwei,Shen Yanran,Liu Wei
Lithium-ion batteries (LIBs) have been developed for over 30 years; however, existing electrode materials cannot satisfy the increasing requirements of high-energy density, stable cycling, and low cost. Here, we present a perovskite-type LaNiO 3 oxide (LNO) as a new negative electrode material. LNO was successfully synthesized by a sol–gel method. The microstructure and electrochemical performance of LNO calcined at various temperatures have been systematically investigated. The LNO electrode shows a high rate capability and long cycling stability. In a C-rate test, a specific capacity of 77 mAh/g was exhibited at 6 C. LNO can also deliver a specific capacity of 92 mAh/g after 200 cycles at 1 C. This paper presents a type of binary metal oxide as a new anode material for high-performance LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机功能材料
·
固态化学
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DOI
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 20
·39830-39836
·
IF 5.1
Shuzhi Zhang,Panpan Lv,Hang Zhan,Le Xin,Jia Wang,Ruihang Li,Yuxin Cui,Tong Pan,Cuncheng Li,Luchao Ren,Mingwei Zhang
Lanthanum nickel oxide (LaNiO 3, LNO) films exhibit excellent electrical conductivity but poor mechanical properties, considerably limiting their further development in the field of flexible electronics. In this study, flexible LNO thin films of different thicknesses were fabricated on a unique two-dimensional (2D) mica platform using a simple metal organic deposition technique. The obtained LNO films exhibited a pseudocubic phase without impurities. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) characterisations proved that the films were well-crystallised, dense, and flat, with controllable thickness. In addition, the flexible LNO/mica element possesses low resistivity (5 × 10 −4 Ω cm), translucency, and good bending resistance. The electrical resistivity can remain stable under various bending radii ( r = 10∼2 mm), thousands of bending cycles, and a wide temperature range (28–200 °C), demonstrating good durability, mechanical stability and temperature resistance. Furthermore, a ferroelectric BiFeO 3 film was constructed based on the obtained conductive LNO electrode, which exhibited typical ferroelectric characteristics. This excellent performance suggests that the flexible LNO electrode is promising for flexible electronic applications.
研究领域:
材料科学
·
柔性电子学
·
薄膜技术
·
功能氧化物
·
电子工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Han Zhang,Zhaoming Luo,Yalun Liu,Yuwen Jiang
In this study, Ni 3 C nanoparticles (NPs) were loaded on LaNiO 3 NPs as a co-catalyst during the photocatalytic H 2 evolution. The evolution rate of the LaNiO 3 -3 wt%Ni 3 C composite (4093.9 μmol g −1 h −1 ) is about 5 times and 2 times as that of pristine LaNiO 3 NPs (819.2 μmol g −1 h −1 ), and 1 wt% Pt loaded LaNiO 3 NPs (1927 μmol g −1 h −1 ). The effects of co-catalyze with Ni 3 C on light absorption, electron-hole spatial separation, and surface H 2 -evolution kinetics are investigated. Loading with Ni 3 C can enhance the spatial separation of electron-hole pairs, and improve the H 2 -evolution kinetics. Further investigation shows that surface decomposition of LaNiO 3 NPs can only be observed when the Ni 3 C content is over 3 wt%, caused by the reductive carbon source needed in the loading process. This work indicates that transition metal carbide can be a promising co-catalyst candidate for oxides in photocatalytic applications without concerning corrosion from the reductive carbonaceous precursors in the loading process.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jie Li,Haifeng Liu,Hongwei Wu,Jiacheng Yang,Ting Deng,Sili Liu,Ruishi Xie,Baogang Guo,Xingquan Zhang,Kui Zheng,Jichuan Huo
In this work, LaNiO 3 epitaxial thin films on (001) single-crystal LaAlO 3 and SrTiO 3 substrates were deposited by polymer assisted deposition method, respectively. Additionally, LaNiO 3 polycrystalline film was coated on ceramic substrate using LaNiO 3 powder obtained from precursor solution in polymer assisted deposition. Due to the difference of lattice mismatch between LaNiO 3 and single-crystal substrates, LaNiO 3 thin films suffer different epitaxial strain, resulting in distortion of NiO 6 octahedrons which increases with the intensity of strain. Such phenomena lead to the decrease of the field splitting energy of NiO 6 octahedron and the band gap value of LaNiO 3 , further increasing the charge transition and enhancing the visible-light photoconductivity . The existence of epitaxial strain brings more Ni 2+ and adsorbed oxygen into perovskite type LaNiO 3 , introduces more oxygen vacancy defects, reduces the complex rate of photo induced electron-hole pairs, and thereby improves the photoelectric activity of LaNiO 3 . This work provides a feasible method to control the structure distortion and photoconductivity effect of all-inorganic perovskite.
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Qiancheng Shang,Junsheng Yu,Rong Hu,Zixiong Liu,Jiang Cheng,Ying Li,Xuxia Shai,Ming-ming Huo,Xin Yang,Lu Li
In this study, a novel metal oxide, lanthanum nickelate (LNO) with a perovskite structure, was introduced into a polymer solar cell (PSC) device, replacing the PEDOT:PSS hole transport layer (HTL). The results show that the LNO-based PTB7-Th:PC71BM solar cell exhibits a higher circuit current density, power conversion efficiency, and stability compared with a device with PEDOT:PSS HTL. To understand the effect of LNO HTL on the performance of devices, the active layer morphology and charge transport characteristics in PSCs were systematically analyzed. The morphology of active layer was affected by the HTL, which further regulated the generation and transport processes of charge carrier in the PSC device. For the LNO HTL, an appropriate thickness (8 nm) and a small surface roughness (Sq = 0.7 nm) can coordinate the energy-level structure of device and improve the interface contact between the FTO electrode and PTB7-Th:PC71BM active layer, promoting the charge transport performance of device. Therefore, this work provides a new consideration for the preparation of efficient, stable, and low-cost polymer solar cells.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2022
·
IF 1.24
M. W. ZHU,B. D. YOU,D. C. SHI,T. N. LU,J. N. WANG,N. JIA,C. Z. LIU
In this work, we prepared LaNiO 3 (LNO) and Au-LaNiO 3 (Au-LNO) films using sol–gel multilayer coating method. The effects of lattice mismatch on the microstructure and electrical properties of the films were investigated by choosing different single-crystal substrate. XRD, SEM, and AFM results showed the high quality of LNO and Au-LNO films, indicating the successful epitaxial growth of the films on the single-crystal substrates. The room temperature resistivity of LNO films increased with the increase of lattice mismatch while different tendency was observed in Au-LNO films, suggesting that different mechanisms prevailed in the LNO and Au-LNO films. Both the transport behavior and the residual resistivity ratio were checked to explore the relationship between the lattice mismatch and the electrical properties of the films. Strain and defect concentration were proposed as the predominating factors for the changes in the resistivity of LNO and Au-LNO films under the influence of lattice mismatch.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
ACS Applied Electronic Materials
·
2026
·
IF 4.7
Sun Yibo,Zheng Yuxi,Zhao Mohan,Zhang Xuefeng,Li Gang,Guan Xiaofei
Rare-earth nickelates ( R NiO 3 ) offer great promise for applications in emergent electronic devices owing to their tunable electrical properties. LaNiO 3 offers processing and operational advantages over heavier R NiO 3 due to its easier synthesis and superior stability. However, the experimental exploration of modulation strategies and the mechanistic understanding of electronic phase transition in thin-film LaNiO 3 remain incomplete. Herein, we demonstrate the electrochemical doping of cations (Li + , Zn 2+ , Mg 2+ , and Al 3+ ) with different radii and valence states into LaNiO 3 thin films prepared by magnetron sputtering and air annealing. A significant increase of resistivity was observed upon ion intercalation into LaNiO 3 under a positive gate voltage (3 V). X-ray photoelectron spectroscopy (XPS) and synchrotron radiation-based X-ray absorption near-edge structure (XANES) have been conducted to unveil the effect of electrochemical doping on the electronic structure change. Specifically, the peak intensity ratio change of Ni L-edge XAS confirms the reduction of the nominal valence of nickel from +3 to +2 after electrochemical doping. The decrease of the relative intensity of the oxygen K-edge pre-edge also confirms the increased electron occupation in Ni 3d–O 2p orbitals and suggests enhanced electron localization. Moreover, first-principles density functional theory (DFT) calculations reveal that the metal–insulator transition of LaNiO 3 was attributed more to the Coulombic repulsion caused by electron doping rather than to the structure distortion.
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DOI
高影响因子
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